Safety device for elevators.



J; N. ANDERSON, SAFETY-DEVICE FOB ELEVATORS; ggzpwmxon nLmi 233.17, 1906.

900,074; Pqtented Oct. 6,1908.

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SATE Y DEVICE FOR ELEVATORS. APPLIOATION FILED FEB. 17, 1905.

Patented out. 6,1908.

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JOHN N. ANDERSON, or NEW YORK, N. Y., ASSIGNOR T0 CHARLES w. HOFFMAN, OF NEW YORK, N. Y.

SAFETY DEVICE non ELEvAToRs.

Specifieationof Letters Patent.

Patented Oct. 6, 1908.

Application filed February 17, 1905. Serial No. 256,022.

hattan, in the county and State of New- York, have invented a new and Improved,

Safety Device for Elevators, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved safety device for elevators, arranged to bring the cage gradually to a stop without shock. or jar in case the car exceeds its normal speed, the arrangement being such that the cage comes to a stop be fore it has acquired too much momentum in its fall.

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and thenpointed out in the claims.

A practical embodiment. of the invention is representedlin the accompanying drawings forming a part of this specification, in \VhICl'I similar characters of reference lndl' cate corresponding parts in all the views.v

' Figure 1 is aside elevation of the improvement as applied; Fig. 2 is an enlarged side-elevation of the lower portion of the cage provided with the improvement; Fig. .3 is ail-enlarged plan view of the same, parts being in section; and Fig. 4: is a sectional side elevation of the same.

The safety device illustrated in the drawings is shown applied to acage A hungon a suspension-cable B for raising or lowering the cage in the usual manner. On the under side of the cage A is arranged a cylindrical drum or pulley C on which are secured thev l for pressing the safety rope I) against a a fixed jaw F whenever the cage A runs heyond a normal rate of speed. The safety 'rope D, after passing around the pulley F,

extends down and around a weighted pulley G and then up over an idler I)? and down over idlers E and E back to thepulley C. The several idlers E, E, E", d"- and E are journalcd on the cage A, so that the safety rope D, under normaltconditions, travels with thecage A, and thus rotates the pulley F of the governor F.

In theends of the hub C of the drum C are mounted to slide and to turn eylindrical nuts H and H having left and right hand screwsthreads l1 and h,1in which screw the correspondingly threaded ends of screwrods I and I provided with wedge-shaped heads J and J for actuating sets of brake-levers K and K carrying shoes L for engaging verticallydisposed guides N fixed in the elevator-shaft in the usual manner. 'lhefscrew-rods I and I. are mounted to slide longitudinally 1n bearings O secured to the under side of the cage A, and each of the said bearings O is'provided with a pin 0,

projecting into a longitudinally-extending groove I formed in the corresponding.

screw rod I, so as to allow the latter to slide in the direction of its length, but to prevent it from turning.

' The levers K or K of each set of levers are fulcrumed at K in bearings P secured to the underside of the cage A, and the inner ends of the lovers of a set of levers K or .K are connected with each other by a spring K, .Lso as to hold friction rollers K, j'ournaled on the lnner ends of the levers, In con- .K and K, to allow a sliding motion .of the brake-shoes on the said pivots L toward and from the guides N. Bow-springs L are interposed between the brake-shocs'and the free ends of the levers, to yieldingly hold the brake-shoes L in frictional contact with the guides N when the levers of the corresponding set of lovers K or IQ-are acluated, as hereinafter more fully described.

' ()n the ends of the hub C of the drum C are secured or. formed lugs Q, projecting into cam-grooves H formed in the periphcral faces of the nuts H and H (see Fig. -1), so that when an initial turning movement is given to the drum C, then the said lugs Q cause the nuts ll and ll to slide bodily toward each other in the direction of the axis of the drum. .liy this movement iven to the nuts ll and II the screw-rods T and I are carried bodily along, so that the heads J and J quickly actuate the sets of brakeinward :mbut :15 due 90 SHINE and i. he

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' 5. A safety device for elevators, ving a drum, a.

inga safety rope, adrum on which are fastened the ends of the safety rope, nuts on which the drum is journaled, screw mods screwing in the said nuts and provided with heads, brake-levers adapted to "be actuated by thesaid heads, means for imparting a bodily sliding motion to the said nuts, screwrods and heads,

to apply the brake-levers quickly on rotating the drum, and means for holding the nuts against turning during their bodily movement.

3. A safety device brake-levers, means for actuating the said brake-levers, brake-shoes mounted to slide on the ends of the said brake-levers, and-springs interposed between the said brake-levers and the shoes.

comprisa brake-shoe 4. "A safety device for elevators, 'ing a fixedguid', abrake-lever,

mounted to slide on the end of the brakemove endwise, and, means for first imparting a bodily endwise movement to the members and rods so as to apply the brakes quickly on rotating the drum and subsequently rotating said members in unison with the drum to impart endwise' movement to the rods for actuating the brakes slowly and more powerfully.

6, A safety device for elevators, comprising a drum, a safe/t rope, the ends of which are secured to the rum, brake levers, memhers on which the drum'is journaled, rods having heads at their outer ends for'operat ing the brake levers, said rods being carried by the members and connected therewith to move endwise, and means for first imparting 4 a bodily endwise movement to the members tating the drum an and rods to'appiy. he brakes quickly on rod subsequently rotating the said members in unison with the drum to impart endwise movement to the rods for actuatin the brake levers slowly and more powerfu ly.. i L g 7.- A safety device for elevators, comprising a safety rope, a drum onwhich are fastened the ends. of the safety-rope, nuts on which the drum is journaled, screw-rods screwing in the said nuts and provided with heads, brake-levers adapted to be actuated by the said heads, hodil y sliding motion to the said nuts, screwrods and heads, to apply the brake-levers gaging the said guides,

for elevators, compris quickly and with a slight means for imparting a quickly on rotating the drum, and means for subsequently rotating the nuts in unison with the druin, to cause the screw-rods to travel in the nuts, for actuatin the brake-levers slowly and more powerful y.- 3 8. A safety device 'for elevators, comprising fixed guides, sets of brake levers for eneads for actuating the said brake-levers, nuts 111 which screw the said screw-rods, a

drum in which the nuts are mounted to. turn and to slide, and meansforimparting a primary sliding motion to the said nuts on rotating the drum and for causing the nuts to subsequently rotate with the drum.

9. Afsafety device for elevators, comprising fixed guides, sets of brake-levers for engaging the said guides, screw-rods having heads for actuating the said brake-levers, nutsfin which screwthe said screw-rods, a

screw-rods having in the direction of. their axes,

drum in which the nuts are mounted to turn and to slide in the direction of their axes,

means for imparting a primary sliding nio.

tionto' the said nuts on rotating the drum the nuts to subsequently and for causing rum, and means for holdm rotate with the the nuts against turning during their sli ing motio 10. A safet device for elevators, comprising fixed gui es, sets of brake-levers for engaging the said heads for actuating the said brake-levers, nuts in which screw the said screw-rods, a

guides, screw-rods having drum in which the nuts are mounted to turn and to .slide in the direction and pins on the said drum, grooves on the said nuts, for impartin first a sliding motion to the said nuts an subsequently a turning motion on rotating the engaging camrum.

11. A safety device. for elevators, comprising fixed guides, sets of brake-levers forengaging the said guides, screw-rods having heads for, actuating the said brake-levers, nuts in 'which' screw the said screw-rods, a drum in whichthe nuts are mounte'dto turn of, their axes,v

and .to slidein the direction of their axes,

pins on the said drum, engaging camgrooves on the said nuts, for imparting first a sliding motion-to the said nuts and subsequently a turning motion on rotatin the'druin, and spring-pressed slidable col ars having lugs engaging external lengthwise extending slots in the turning, the said slots terminating in screw threads. i

In testimony whereof 1 two subscribing witnesses.

said nuts, to hold the la'tteufrom have igned'myname to this specification in the presence of 

